Grey County Grey County is a county in Ontario, Canada. In 2016, it had a population of 93,830. The county seat is in the city of Owen Sound. vteSubdivisions of OntarioCounties Bruce Dufferin Elgin Essex Frontenac Grey Haliburton Hastings Huron Lambton Lanark Leeds and Grenville Lennox and Addington Middlesex Northumberland Perth Peterborough Prescott and Russell Renfrew Simcoe Stormont, Dundas and Glengarry Wellington Districts Algoma Cochrane Kenora Manitoulin Nipissing Parry Sound Rainy River Sudbury Thunder Bay Timiskaming Regional municipalities Durham Halton Muskoka Niagara Oxford Peel Waterloo York Single-tier municipalities Brant Brantford Chatham-Kent Greater Sudbury Haldimand Hamilton Kawartha Lakes Norfolk Ottawa Prince Edward Toronto Separated municipalities Barrie Belleville Brockville Cornwall Gananoque Guelph Kingston London Orillia Pembroke Peterborough Prescott Quinte West Smiths Falls St. Marys St. Thomas Stratford Windsor Regions Southern Ontario Central Ontario Eastern Ontario Golden Horseshoe Southwestern Ontario Northern Ontario Northeastern Ontario Northwestern Ontario Ontario communities Ontario municipalities Ontario electoral districts Former counties of Ontario Geography of Ontario Category:Ontario WikiProject: Ontario